The song is about someone who cheated on someone else ("How many times do I have to try to tell you
That I'm sorry for the things I've done "/"I may be viciously unkind").
They feel really bad and they aren't truly a bad person but they just got screwed up. They feel that the other person may be too good for them ("And I've heard it said too many times That you'd be better off ") so they got scared.
She/He tries to apologize but the other person doesn't want to forgive right away. Instead they just say thinks to hurt the other person ("But when I start to try to tell you That's when you have to tell me Hey, this kind of trouble's only just begun"/"Some things are better left unsaid But they still turn me inside out ").
The song in the point of view of the adulterer to show that they are human and have feelings even though they hurt the other.
Here is my intepretation:
The song is about someone who cheated on someone else ("How many times do I have to try to tell you That I'm sorry for the things I've done "/"I may be viciously unkind").
They feel really bad and they aren't truly a bad person but they just got screwed up. They feel that the other person may be too good for them ("And I've heard it said too many times That you'd be better off ") so they got scared.
She/He tries to apologize but the other person doesn't want to forgive right away. Instead they just say thinks to hurt the other person ("But when I start to try to tell you That's when you have to tell me Hey, this kind of trouble's only just begun"/"Some things are better left unsaid But they still turn me inside out ").
The song in the point of view of the adulterer to show that they are human and have feelings even though they hurt the other.